<template>
  <div>
    <!--搜索框-->
    <div class="pd-10">
      <el-input style="width: 200px" suffix-icon="el-icon-search" placeholder="请输入名称" class="mr-5" v-model="name"></el-input>
      <el-button class="ml-5" type="primary" @click="load">搜索</el-button>
      <el-button type="warning" @click="reset">重置</el-button>
    </div>
    <!--新增按钮-->
    <div class="mg-10">
      <el-button class="ml-5" type="primary" @click="handleAdd" v-if="user.role === 'ROLE_ADMIN'">
        <i class="el-icon-circle-plus-outline"></i>新增
      </el-button>
      <!--批量删除-->
      <el-popconfirm
          title="您确定批量删除这些数据吗？"
          @confirm="delBatch" v-if="user.role === 'ROLE_ADMIN'">
        <el-button class="ml-5" type="danger" slot="reference">
          <i class="el-icon-remove-outline"></i>批量删除
        </el-button>
      </el-popconfirm>
    </div>
    <el-table :data="tableData" border stripe :header-cell-style="{background: '#cccccc'}"  @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="50">
      </el-table-column>
      <el-table-column prop="id" label="ID">
      </el-table-column>
      <el-table-column prop="name" label="课程名称" width="140">
      </el-table-column>
      <el-table-column prop="score" label="学分" width="120">
      </el-table-column>
      <el-table-column prop="times" label="课时">
      </el-table-column>
      <el-table-column prop="teacher" label="授课老师" width="120">
      </el-table-column>
      <el-table-column prop="state" label="是否开课">
        <template slot-scope="scope">
          <el-switch v-model="scope.row.state" active-color="#13ce66" inactive-color="#cccccc" @change="changeEnable(scope.row)"></el-switch>
        </template>
      </el-table-column>
      <el-table-column label="操作">
        <template slot-scope="scope">
          <el-button type="success" @click="selectCourse(scope.row.id)" v-if="user.role === 'ROLE_STUDENT'">选课<i class="el-icon-edit"></i></el-button>
          <el-button type="success" @click="handleEdit(scope.row)" v-if="user.role === 'ROLE_ADMIN'">编辑<i class="el-icon-edit"></i></el-button>
          <el-popconfirm
              class="ml-5"
              confirm-button-text='确定'
              cancel-button-text='我再想想'
              icon="el-icon-info"
              icon-color="red"
              title="您确定删除吗？"
              @confirm="del(scope.row.id)">
            <el-button type="danger" slot="reference" v-if="user.role === 'ROLE_ADMIN'">删除<i class="el-icon-delete"></i></el-button>
          </el-popconfirm>
        </template>
      </el-table-column>
    </el-table>
    <!--分页-->
    <div style="padding: 10px 0">
      <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="pageNum"
          :page-sizes="[5, 10, 15, 20]"
          :page-size="pageSize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
      </el-pagination>
    </div>
    <!--新增编辑弹出框-->
    <el-dialog title="课程信息" :visible.sync="dialogFormVisible" width="30%">
      <el-form :model="form" size="small">
        <el-form-item label="课程名称" label-width="80px">
          <el-input v-model="form.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="学分" label-width="80px">
          <el-input v-model="form.score" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="课时" label-width="80px">
          <el-input v-model="form.times" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="授课老师" label-width="80px">
          <el-select clearable v-model="form.teacherId" placeholder="请选择授课老师" style="width: 100%">
            <el-option v-for="item in teachers" :key="item.id" :label="item.nickname" :value="item.id">
            </el-option>
          </el-select>
        </el-form-item>
<!--        <el-form-item label="是否开课" label-width="80px">-->
<!--          <el-input v-model="form.state" autocomplete="off"></el-input>-->
<!--        </el-form-item>-->
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="save">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Course",
  data() {
    return {
      tableData: [],
      name: "",
      form: {},
      teachers: [],
      dialogFormVisible: false,
      multipleSelection: [],
      //分页
      pageNum: 1,
      pageSize: 5,
      total: 0,
      user: localStorage.getItem("user") ? JSON.parse(localStorage.getItem("user")) : {}
    }
  },
  methods: {
    load() {
      this.request.get("/course/page",{
        params: {
          pageNum: this.pageNum,
          pageSize: this.pageSize,
          name: this.name
        }
      }).then(res => {
        console.log(res);
        this.tableData = res.data.records
        this.total = res.data.total
      })
    },
    save() {
      this.request.post("/course/save",this.form).then(res => {
        if (res.code === "200") {
          this.dialogFormVisible = false
          this.form = {}
          this.$message.success("保存成功")
          this.load()
        }else {
          this.$message.error("保存失败")
        }
      })
    },
    selectCourse(courseId) {
      this.request.post("/course/studentCourse/" + courseId + "/" + this.user.id).then(res => {
        if (res.code === "200") {
          this.$message.success("选课成功")
        }else {
          this.$message.error(res.msg)
        }
      })
    },
    del(id) {
      this.request.delete("/course/"+id).then(res => {
        if (res.code === "200") {
          this.$message.success("删除成功")
          this.load()
        }else {
          this.$message.error("删除失败")
        }
      })
    },
    handleAdd() {
      this.dialogFormVisible = true
      this.request.get("/user/role/ROLE_TEACHER").then(res => {
        if (res.code === "200") {
          this.teachers = res.data
        }else {
          this.$message.error("授课老师信息获取失败")
        }
      })
    },
    handleEdit(row) {
      this.form = Object.assign({},row)
      this.request.get("/user/role/ROLE_TEACHER").then(res => {
        if (res.code === "200") {
          this.teachers = res.data
        }else {
          this.$message.error("授课老师信息获取失败")
        }
      })
      this.dialogFormVisible = true
    },
    handleSelectionChange(val) {
      console.log(val)
      this.multipleSelection = val
    },
    delBatch() {
      let ids = this.multipleSelection.map(v => v.id)
      this.request.post("/course/del/batch",ids).then(res => {
        if (res.code === "200") {
          this.$message.success("批量删除成功")
          this.load()
        }else {
          this.$message.error("批量删除失败")
        }
      })
    },
    reset() {
      this.name = ""
      this.load()
    },
    handleSizeChange(val) {
      console.log(`每页 ${val} 条`);
      this.pageSize = val;
      this.load()
    },
    handleCurrentChange(val) {
      console.log(`当前页: ${val}`);
      this.pageNum = val
      this.load()
    },
    handleFileUploadSuccess(res) {
      console.log(res)
      this.load()
    },
    download(url) {
      window.open(url)
    },
    changeEnable(row) {
      this.request.post("/course/update",row).then(res => {
        if (res.code === "200") {
          this.$message.success("操作成功")
          this.load()
        }
      })
    }
  },
  created() {
    this.load()
  },
  watch: {
    dialogFormVisible() {
      if (this.dialogFormVisible === false) {
        this.form = {}
        console.log("执行了watch方法")
      }
    }
  }
}
</script>

<style scoped>

</style>